Yeah there have been other studies on where All-Pros have been taken. (I think Andy Mertig on Pack-a-day podcast?)
Shocker - most of the time it's in the first round. That's where you'll find highest level of talent. That said, some positions have enough later round picks where a case can be made for drafting later.
Just going by process of elimination, it's unlikely Gute will take a CB in R1 because they have plenty signed and paid Nixon like a starter. RB? No prospects. Same for S and LB, unless they really reach. They aren't taking a QB. History plus the roster likely rules out WR and TE.
That pretty much leaves you with OL or DL (including EDGE).